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Magnetic and microstructural properties of Fe3O4-coated Fe powder soft magnetic composites
Journal article   Peer reviewed

Magnetic and microstructural properties of Fe3O4-coated Fe powder soft magnetic composites

Katie Jo Sunday, Francis G. Hanejko and Mitra L. Taheri
Journal of magnetism and magnetic materials, v 423, pp 164-170
01 Feb 2017
DOI: https://doi.org/10.1016/j.jmmm.2016.09.024

Abstract

Core loss Inorganic coating Magnetic properties Soft magnetic composites
Soft magnetic composites (SMCs) comprised of ferrite-coated ferrous powder permit isotropic magnetic flux capabilities, lower core losses, and complex designs through the use of traditional powder metallurgy techniques. Current coating materials and methods are vastly limited by the nonmagnetic properties of organic and some inorganic coatings and their inability to withstand high heat treatments for proper stress relief of core powder after compaction. Ferrite-based coatings are ferrimagnetic, highly resistive, and possess high melting temperatures, thus providing adequate electrical barriers between metallic particles. In this work, iron powder was coated with Fe3O4 particles via mechanical milling, then compacted and cured in an inert gas environment. We find density and coercivity to improve with increasing temperatures; however, core loss greatly increases, which is attributed to the formation of a more conductive iron-oxide phase and less resistive Fe volume. Our work begins to exemplify the unique qualities and potential for ferrite-based coatings using traditional powder metallurgy techniques and higher curing temperatures for electromagnetic devices. •Fe3O4-coated Fe powder was produced via mechanical milling, then compacted and cured into composite form.•SEM/EDS confirm Fe particles are individually isolated with iron-oxide coating material.•Larger particle sizes show improved core loss and coercivity measurements.•We report good magnetic properties for compaction at 800MPa and a curing temperature of 700°C.

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65 citations in Web of Science
65 citations in Scopus

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Collaboration types
Industry collaboration
Domestic collaboration
Web of Science research areas
Materials Science, Multidisciplinary
Physics, Condensed Matter
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